Nothofer, Bernd, author
Martinus Nijhoff , 1975
Buku Teks
Mannheim, Karl, author
Harcourt, Brace, 1951
Buku Teks
edited by Freddie H. Fu, Steven B. Cohen
Slack Incorporated, 2008
Buku Teks
World Bank
World Bank Office Jakarta, 2011.
Buku Teks
Natterer, Frank, author
Society for Industrial and Applied Mathematics, 2001
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